Method of making tight fitting nuts



"July 9,' 1935. w. E. SHARP I 2,007,310

METHOD OF MAKING TIGHT FITTING NUTS Filed Aug. 31, 1932 mM. Hn:sim,,

INVENTOR Q ma asza ATTORNEY Patented July 9, 1935 r WW METHOD or MAKING'rI'G NUTS [William nshamcncmnnmmm, E eiecut rix of'theestateol saidSharp. (100080011 3, a

"This invention relatesto wrench tight fitting nuts and, moreparticularlyto such which are readily produced from hot forged nutblanks of uneven thickness, and the processof making such i Theprincipal objector my inventicmgenerally I considered, is to provide aprocess of making wrench tight fitting nuts from hot forged nut,

blanks of uneven height, whereby such nuts may be produced more cheaplyand readily than the usual type "of lock nuts; 1

Another object of myinventionisthe provision of a method ofmaking-wrench tightlfittlng nuts involving operating ,on-hot forged nutblanks of ,noneuniformthickness to bring "them all to "uni- "form,thickness within narrow "limits 'tappin'g said-blanks to cut threads,thereon, and finally v subjecting "each ,blan k uto .a blow to reducethe 1 distance-betweena few threads'acijacent'one face so that-whenthreaded on a corresponding bolt,

ting action thereon. y

these'threads win bind with the desired tight flt- A further objectof'myinvention isftcmanm factu're wrench tight fitting. nuts ofuniform'horizontal section'and havingthe appearance of ordinarycommercial'nuts, said'nutsbeing threaded andhaving the linear pitch ofthe threads adiacent o ne face thereof slightly smaller thannorcorrespcnding'bolt.

' relating to the particular arrangement and conrent as thedescriptioniproceeds.

ters, there is shown a machine 1 involving an just described, to rendermal, so'that they willbind'onth'e threads of a Other objectsandadvantages of the invention mammalian. 3i, 1932, Serial No. 031,250

" *sc ai ns, (c1. 1'0-as) a v 0 tamjmanguuoe an as threads (thereof,there would be va-variation in" such action if thenuts were treateduniformly in such a machine in accordance with the" variation in theheight there- 1nut' blanks'before threading, so that the desired ormtightfltting eflect may be produced by a desired uniform treatment.

fl Now referring' to the drawing in detaiLlike" parts being designatedby like reference characanvil 2 adjustable in any desired manneras bymeans of, having itslower face 3 inclined and engaginga complementaryincline 4 on a base, 5,

and adapted for adjusting movement by means v of a connected link 6 anda cooperating hammer or pressure member I. The machine is adapted toreceive nuts one at a. time, or in a uniform manner, as from achute Iand belt 8 which carries the-nuts at the desired rate of speed over theanvil-to and beneath the hammer I, whereby, as the machine operates,each nut blank 9, representinglone of a batch of blanks ofjirregular oruneven thickness, has its height reduced to a uniform thickness to adegree notvaryin'g .005".

, After the nut blanks have been processed, as

them of uniform thickaccuracy specified, they to cut threads or thedeness within the degree of are tappedor machined sired form thereon, asrepresented in Figure 2.

This thread-cutting operation may be performed in any desired manner, asby means of commer-s cial automatic machinery.

Afterthe nut blanks have been threaded, theyare subjected to a pressureor hammer blow to ii, reduce the distance between the threads in thetop. portion of the nut, and produce a nut slightly decreased in height,as represented in Figure 3.- so that when they are turned upon a bolt,such top threads will bind to the desired degree on 40 the bolt threadswith a. grippingaction. The 5 production of the gripping action onthethreads 0 I5) Referring tothe drawingillustrating my 111-} a Y,fvention, the scope whereof is deflned'bythe ap-,

- pended-claims':- g r I 1- q ,Figure l is a fragmentary view showing apor- 'tion of a machine for acting onnutblanks to do bring them all tothe desired'uniform thickness.

Figure 2 is a vertical sectional view of the nut after being'broug'ht toadesired height, as'bythe machine shown m l i re' ia t Figure 3 is acorresponding'view of anut such 0 asshown in Figure 2 after beingfurthertreated i ,to reduce the linear'pi f h of a few threads ad-Jacentthe upp r facethereoi.v

Figure 4 is anenlarged'fragmentary sectional view showing a. nutembodying my invention appliedto an associated bolt. v 1

Aslis well known, the hot forged run of nut blanks involves a variationinthe'height of the blank or distance between the upper and lower facesthereof. If such blanks, after threading, were treated in a machine toproduce s. desired may be effected in any desired manner, as bymanufactured'much cheaper than the previous forms of, lock nuts,'in thatthe blanks employed are ordinary nut blanks rather than specially formedblanks. The grippingaction provided is limited tothetop threads Ill inthe nuts 9 rather than being distributed to the entire series of 68 eansof a machine similar to that which inthreads, because it has been proventhat in subthreads thereon, and finally subjecting each of jecting suchnuts to pressure, as heretofore dethem to a blow to reduce the distancebetween scribed, the metal will flow or crush near the the threads inthe top portions thereof to a desurface without any material change inthe sired extent.

threads on the portion of the nut away from the 2. The method of makingnuts adapted to bind 5 surface. This action is illustrated in Figure 4,in on an associated bolt comprising passing commerwhich it is shown thatthe outermost threads ll cial nutblanks of non-uniform thickness throughare crowded together with'the taking up of ,all a machine to bring themall to uniform thicklead clearance with respect to the associated boltness, tapping said nut blanks to cut threads therell, while the threadsI! away from the surface on, and finally subjecting each to a blow tocrowd m of the nut are unchanged and have the usual threads adJacent onesurface thereof to a declearance II with respect to the threads it onthe aired extent.

bolt H. 8. The method of making nuts adept-ed to fit Although apreferred embodiment of my inventight on an associated bolt comprisingprocessing tion has been disclosed, it will be understood thatcommercial nut blanks before threading so as to 15 modifications may bemade within the spirit and make all of said blanks of the same thicknessscope of the appended claims. within a degree of accuracy not varying.005 inch,

I claim:- threading said blanks, and again subjecting them i. The methodof making wrench tight fitting to pressure so as to reduce the distancebetween nutscomprising operating on commercial nut the points of threadsadjacent one face thereof. blanks of uneven thickness to bring them allto 7 WILLIAM E. SHARP.

uniform thickness, machining said blanks to cut

